Some of my males will display two adjacent lines on their faceplates when they are ready, while others just make a large nest.
The last one I conditioned, I had him in 6 inches of water, heated to 80, live plants, fake plants, hidey hole, and did a variety of live, frozen, freeze dried and pellet foods
Works a LOT better with variety diet, temperature, etc. I show them the female (glass bowl, tube, floating tub, etc), for about an hour or so then remove her and do it again later than day, and they usually make a nest. The next day I do it again, but this time having her in a breeder's net, and it usually gets him rallied up to breed
Take in mind some male bettas are just not breeders
How old is Dizzy, do you think? Have you tried a different female? I have a few females, in case the first choice doesn't work out.